Reportable Business Segments (Details 2) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income	$ 205,633	$ 166,421	$ 383,406	$ 301,911
Interest expense	(11,371)	(9,968)	(21,387)	(19,981)
Stock-based compensation expense	(7,061)	(6,172)	(13,381)	(11,615)
The change in contingent acquisition related obligations	17,813		17,813
Total
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income	212,880	190,940	414,451	349,645
Unallocated Amount to Segment
Reconciliation of segment operating income to consolidated income before income taxes
Interest expense	(11,371)	(9,968)	(21,387)	(19,981)
Interest Income	2,311	1,117	4,129	1,919
Stock-based compensation expense	(7,061)	(6,172)	(13,381)	(11,615)
The change in contingent acquisition related obligations	17,813		17,813
Other costs, net	$ (8,939)	$ (9,496)	$ (18,219)	$ (18,057)

The change in contingent acquisition related obligations.

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Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
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Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Subparagraph 1(i)
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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 34
-Paragraph 21

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
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